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SDE-1 (Backend Developer)

TravClan

  • Delhi NCR, India
  • Competitive Package
  • 1-4 Years
  • Posted Today
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About the role

We are B2B Travel Tech startup that is reshaping the way travel agents sell and deliver exceptional travel experiences worldwide. We enable travel agents to book flights, hotels & holidays conveniently and we provide comprehensive end-to-end on-ground travel services. We do over INR 1000 crore+ GMV (sales) and are growing rapidly.

Our strong business model and focus on delivering excellent customer experience has facilitated our sustainable growth funded by internal cashflows. To fuel innovation and growth, we have raised USD 5.5mn+ funds from marquee global investors!

What is on offer

  • Best combination of Salary, INR 7 to 14 LPA
  • Work with a young & passionate team to excel and make an impact
  • Work closely with the founders
  • Fast Career Growth with fast appraisals and fast salary increase
  • Super passionate team with deep conviction which has stayed together during covid.
  • Very high ownership role in a fast-paced environment
  • Great Culture -> No hierarchy/politics nonsense guaranteed!

Growth Path

  • VP/Director - 40-50 LPA
  • Manager/ Tech Lead - 25-40 LPA
  • APM/SDE 2 - 14-25 LPA
  • Analyst/SDE 1 - 7-14 LPA

About us

The founding team has aced their respective leadership roles at successful internet startups in India, which are as follows:

  • Ashish: Cofounder, leads technology, Ex CTO Cars24, CTO FabFurnish, Gaadi.
  • Arun: Cofounder, leads product, Ex Cars24, TravelTriangle, TripFactory, IIM Bangalore.
  • Chirag: Cofounder, leads business, Ex Oyo, TravelTriangle, IIM Ahmedabad, IIT Roorkee.
  • Shrawan: VP Engineering, 20+ yrs Tech exp, Ex CTO Millenium Entertainment, One Kosmos
  • Akshat: Director Engineering, 16+ yrs Tech exp, Ex Cars24, L&T, Samsung US, Motorola US.
  • Rajesh: Director Engineering, 15+ yrs Tech exp, Ex Hike, Foodpanda

Key Responsibilities

  • Design, develop, and maintain scalable backend services and RESTful/GraphQL APIs using Python (Django/FastAPI/Flask) and Node.js (Express/NestJS).
  • Build and optimize microservices architecture, ensuring high availability, performance, and fault tolerance.
  • Design and manage relational and NoSQL database schemas (PostgreSQL, MySQL, MongoDB, Redis).
  • Integrate third-party APIs and services (payment gateways, travel inventory/GDS systems, notification services).
  • Write clean, well-tested, maintainable code with strong unit/integration test coverage.
  • Optimize application performance, including query optimization, caching strategies, async processing, and load handling.
  • Implement message queues and event-driven systems (Kafka, RabbitMQ, SQS) for asynchronous workflows.
  • Collaborate with DevOps to containerize and deploy services (Docker, Kubernetes, CI/CD pipelines).
  • Participate in code reviews, architecture discussions, and technical design decisions.
  • Debug and resolve production issues, working with observability tools (logging, monitoring, tracing).
  • Ensure security best practices in API design, including authentication, authorization, input validation, and data protection.

Must have technical skills -

  • Strong proficiency in Python (Django, FastAPI, or Flask) or Node.js (Express/NestJS).
  • Solid understanding of RESTful API design principles; experience with GraphQL is a plus.
  • Experience with relational databases like MySQL/PostgreSQL and NoSQL databases such as MongoDB.
  • Hands-on expertise with Redis and Elasticsearch.
  • Experience with message queuing systems like RabbitMQ, Kafka, or SQS.
  • Familiarity with Docker for containerization.
  • Good understanding of microservices architecture and distributed systems fundamentals.
  • Strong understanding of data structures, algorithms, and system design fundamentals.
  • Good grasp of application security practices (OWASP basics, JWT/OAuth, input sanitization).
  • Ability to write unit/integration tests (pytest, Jest, Mocha).
  • Knowledge / hands-on experience of the following are added advantages:
  • Kubernetes for orchestration.
  • CI/CD pipelines using Jenkins, GitHub Actions, or GitLab CI.
  • Firebase integration and usage.
  • API gateway and rate-limiting strategies.
  • Real-time systems (WebSockets, Socket.io).
  • Cloud platforms (AWS/GCP) and serverless architectures.

Check if you fit in the role-

You Must

  • Have 1-4 years of professional backend development experience.
  • Enjoy working in a fast-paced environment.
  • Be focussed on creating scalable systems.
  • Enjoy solving problems in a structured way.

You Can

  • Understand & break down complex problems into smaller tasks.
  • Work closely with various stakeholders.
  • Bring good understanding of caching layers (Redis, Memcached) and CDN strategies as a plus.
  • Bring experience in travel-tech, fintech, or high-transaction-volume platforms as a plus.

You Want to

  • Develop robust solutions for the travel ecosystem.
  • Design, build and launch global products.

This role is not ideal for someone who

  • Has not worked on 2-3 backend applications independently
  • Lacks basic proficiency in either Python (Django) or Node.js (Express).
  • Has not created any backend applications from scratch
  • Is not comfortable with long working hours.
  • Is not comfortable working 5 days a week from office in Delhi

Important Points

  • Office Location- Connaught Place, Delhi
  • Work Timings - You are considering joining a startup. Building anything of value takes time.

Eligibility & process

Who can apply

Seniority: Entry level. Employment type: Full-time

Skills & stack

Python JavaScript Node.js Express.js Django FastAPI Flask NestJS

Selection process

Details are shared by the recruiter after shortlisting.

Prep kit

20 resources
Study material 4
Company-specific guides 4
Likely coding questions 4
Round-wise strategy 4
Round 1: Online Assessment (OA) Aptitude, Quantitative Logic & 2 Coding Problems Focus on accuracy and speed. Practice arrays, strings, and standard arithmetic puzzles.
Round 2: Technical Interview 1 Core Tech Stack (Python, JavaScript, Node.js, Express.js, Django, FastAPI, Flask, NestJS) & Live Code Tracing Explain your thought process aloud. Analyze time & space complexities before coding.
Round 3: System Design & Problem Solving Database Schemas, APIs & Architecture Basics Clarify edge cases, diagram schemas cleanly, and discuss scalability trade-offs.
Round 4: HR & Cultural Fit Discussion TravClan Core Values, Learning Agility & Offer Terms Demonstrate passion, strong communication, and readiness for full-time collaboration.
Technical questions 5
Explain OOP (Object-Oriented Programming) principles with real-world examples in Python. Answer
Model answer: 1. Encapsulation (data hiding via private fields/getters). 2. Abstraction (hiding implementation complexity). 3. Inheritance (code reusability). 4. Polymorphism (method overriding/overloading).
What is the time and space complexity of QuickSort vs MergeSort? Answer
Model answer: QuickSort: Average O(N log N) time, O(log N) space. Worst O(N^2). MergeSort: Guaranteed O(N log N) time, but requires O(N) auxiliary space.
Explain the difference between SQL Indexing (B-Tree vs Hash) and when not to use an index. Answer
Model answer: Indexes speed up SELECT queries via B-Trees. However, they slow down INSERT, UPDATE, and DELETE operations because indexes must be updated on disk. Avoid on low-cardinality columns (e.g., boolean flags).
What happens under the hood when you enter a URL in a browser? Answer
Model answer: 1. DNS lookup (resolves IP). 2. TCP 3-way handshake (SYN, SYN-ACK, ACK). 3. TLS negotiation for HTTPS. 4. HTTP GET request sent. 5. Server responds with HTML/CSS/JS. 6. Browser renders DOM & CSSOM tree.
What is the difference between REST and GraphQL APIs? Answer
Model answer: REST uses multiple fixed endpoints with possible over/under-fetching. GraphQL uses a single endpoint allowing clients to query exact fields in a single request.
Behavioural & HR questions 3
Why do you want to join TravClan as a SDE-1 (Backend Developer)?
Highlight TravClan's market reputation, recent tech innovations, and how your skills in Python directly solve their team's objectives.
Describe a challenging bug or academic project roadblock and how you resolved it.
Use the STAR method: Situation (project context), Task (what needed solving), Action (specific tools/logic applied), Result (quantifiable positive outcome).
How do you handle strict deadlines or sudden scope changes?
Explain your prioritization strategy, proactive communication with mentors/peers, and agile mindset.
TravClan Competitive Package
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